Display screen or portion thereof with graphical user interface for a radiation treatment



FIG. 1 shows a display screen or portion thereof with graphical user interface for a radiation treatment; and,

FIG. 2 shows the display screen or portion thereof with graphical user interface for a radiation treatment of FIG. 1 in an environment of a radiation treatment system display.

The portions shown in broken line or bounded by broken line are directed to environment and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with graphical user interface for a radiation treatment, as shown and described. 